Hmmm, I got to consider that "inside a creature" thing. As the game world is seamless, it needs to make sense somehow that there's a creature which you can enter by some strange reason. It can't be like in WaDF where That Hover Thing is much bigger on the inside than the outside, because the game doesn't support that.

I guess I did that once in WaDF but I need to figure out a way for it to make sense in this world, since that large creature won't be able to move around.

...or perhaps it'll sort of be like some strange amoeba like creature that have consumed a cave in the game world or something.

well, couldn't it be like in seiklus, that you only can access the "outside" of the creature partly, because it's at some corner or cul-de-sac of the game world, and can enter it then and explore the big(ger than outside-ly viewable) inside. maybe that's actually kind of like you mean it there.